Karol Bednarek

Electromagnetic Action of Heavy-Current Equipment Operating With Power Frequency

The paper presents an analysis of the effect of magnetic fields of power frequency generated by heavy-current electric equipment on the environment. The results of computation and measurements of the magnetic field in the vicinity of power busducts are included. Possible hazards are considered that result from the effects of the magnetic field on workers present in the vicinity of busducts as well as secondary hazards caused by the degrading effect of the magnetic field on ferromagnetic structural materials (in reinforced concrete structures). Attention is given to an ergonomic aspect of interaction of the magnetic field with cathode ray tube computer monitors (annoying oscillation of the image).

An application of genetic algorithm for three phases screened conductors optimization

The paper presents a comparison of classical and genetic methods of dimensional optimization of three-phase heavy-current lines (busways), screened with a view to minimizing the use of material of phase conductors and their screen. A mathematical model is presented for electro-dynamical calculations of the screened line, determining the distribution of current density and temperature in the conductors and their screen, as well as electrodynamical forces. Special attention is paid to the possibility of improving the performance of optimization calculation through application of the genetic method and computers provided with several, simultaneously operating processors. Results of the calculations for various optimization methods are presented and discussion of the results is enclosed.